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Question
Solve graphically
x + y = 7, x – y = 3
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Solution
x + y = 7
y = 7 – x
| x | – 2 | 0 | 3 |
| y | 9 | 7 | 4 |
Plot the points (– 2, 9), (0, 7) and (3, 4) in the graph sheet
x – y = 3
– y = – x + 3
y = x – 3
| x | – 2 | 0 | 4 |
| y | – 5 | – 3 | 1 |
Plot the points (– 2, – 5), (0, – 3) and (4, 1) in the same graph sheet.
The point of intersection is (5, 2) of lines (1) and (2).
The solution set is (5, 2).
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